Lamp cord



Nov. 2, 1937. J. H. JEwr-:LL ET AL LAMP CORD Filed June 1, 1951 PAPE/ 5. 7 im @Wi/z 1. Hg NN MW .Patented Nov. 2, 1937 PATENT OFFICE LAMP CORD John H. Jewell and Owen A. McNamee, Worcester, Mass., assignors to The American' Steel and Wire -Company of New Jersey, a corporation of New Jersey Application June 1, 1931, Serial No. 541,414

9 Claims.

Our invention relates to electric cord particularly adapted for wiring lamps and the like, one o'f our objects being to provide an electric cord of improved construction.

In the drawing:

Figure 1 is a plan View of a section of lamp cord constructed in accordance with this invention.

Figure 2 is a cross-sectional elevation through the cord of Figure l.

Having reference to this drawing, there is shown an electric cord having a conductor l made from a plurality of copper wires laid spirally together, a paper strip 2 being laid longitudinally on this conductor and folded thereabout so as to completely enclose the same. A rubber compound is moulded about this conductor and paper strip to form an insulating waterproof covering 3, and anfabric outer protective covering 4 is fitted over a The rubber covering 3 cannot be applied directly to the conductor I, because it, while plastic, would flow into and fill the interstices between the conductors individual copper wires, making it very difficult to strip this covering off the conductor when a connection or splice is to be made.

The paper strip 2 adequately prevents this from happening. As it is longitudinally laid on the conductor, it may be easily slid olf the same when cut thru, this being a great advantage over cord having a spirally wound paper strip,as the latter clings to the conductor making its removal slow and tedious. Further, by simply pulling the strip 2 at right angles to the cord, the rubber covering may be split and thus easily removed, the fabric covering 4 having been first removed.

If the conductor consists of a single comparatively heavy wire it is not necessary to completely enclose it, as the rubber covering Will not stick to such a great extent. The paper strip might, therefore, in this instance be reduced in size, and might in any event be made of other material than paper. Of course, the quick stripping feature is thus retained regardless of these variations.

Although We have shown and described a specific example of our invention in accordance with the patent statutes, we do not intend to limit ourselves thereto except as dened by the appended claims.

We claim:

1. The combination of a conductor made from a plurality of uninsulated Wires laid spirally to- (ci. 173-264) v i insulating covering, said paper strip being Suiilciently strong to split said insulating covering when pulled at an angle to said conductor.

2. An insulated electric conductor comprising a metallic core, a completely surrounding separating layer of flexible cellulosic sheet material of initial tape-like form, said material being folded tubularly over the bare metallic core, with its edge portions parallel whereby it is laid in straight longitudinal parallelism with the core, next to and in direct continuous contact with said metallic core and in readily removable non-adhesive relation thereto, and a sheath of rubber insulating material surrounding said longitudinally laid separating layer.

3. The method of manufacturing an insulated electric conductor which comprises continuously folding a cellulosic separating strip of indefinite length directly about a bare metal core in substantial' longitudinal parallelism with it, and nonadhesively holding said separating strip in said position and applying a rubber insulating layer about the strip and said metal core directly contained in the strip.

4. An insulated electric conductor of the socalled appliance cord and other similarly light non-armored types including radio hook-up Wire comprising a metallic core, a completely surrounding saparating layer of *iexible cellulosic sheet material of initial tape-like form, said material being folded tubularly over the bare metallic core, with its edge portions parallel whereby it is laid in straight longitudinal parallelism with the core next to and in direct continuous contact with said metallic core and in readily removable relation thereto, and a sheath of rubber insulating material surrounding said longitudinally laid separating layer.

5. The method of manufacturing an insulated electric conductor of the so-called appliance cord and other similarly light non-armored types including radio hook-up Wire which comprises continuously folding a cellulosic separating strip of indefinite length directly about a bare metal core in substantial longitudinal parallelism with it, and holding said separating strip in said position and applying a rubber insulating layer about the strip and said metal core directly contained in the strip.

6. The method of manufacturing an insulated electric conductor which comprises folding a cellulosic separating strip of indefinite length digrectly about a bare metal core in substantial longitudinal parallelism with it, and non-adhevsive'y holding said separating strip in said posi- 65 tion and applying a rubber insulating layer about thestrip and said metal core directly contained in the strip;

7. The method of manufacturing and insulating electric conductors of the so-called appliance cord and other similarly light non-armored types including radio hook-up wire which comprises folding a cellulosic separating strip directly about a bare metal core in substantial longitudinal parallelism with it, and holding said separating strip in said position and applying a rubber insulating layer about the strip and said metal core directly" contained in the strip.

8. The combination of a conductor comprisin a plurality of uninsulated wires laid together, a paper strip'laid longitudinally directly on said conductor and folded about it so as to enclose the same completely, and an insulating covering applied over said paper strip.

9. An. insulated electric conductor comprising, in combination, an uninsulated. metallic conducting core, a paper strip laid 'longitudinally directly on said core and folded about it so as to enclose the same completely, and an insulating covering la applied `over said paper strip.

-JOHN H. .W1 'ifi i` l @WEN A. McNM/DEE. 

